Improvement design of hydraulic components and structure of vertical self-priming pump

Abstract

To improve the vertical self-priming pump's performance,a novel self-priming pump construction is presented on the basis of the traditional structure.Optimized hydraulic components and matching structures between the volute and the air-water separation chamber were adopted to reduce the hydraulic losses.Multistage auxiliary-impeller was used to reduce the mechanical losses while improving the sealing performance.A special discharge structure was also proposed to ensure the self-priming performance.Three dimensional simulation of the internal flow in the self-priming pump was carried out to find the main loss areas and its loss mechanism.The simulation results are in good agreement with the experimental results,and show that the air-water separation chamber and the auxiliary-impeller are the main places of extra loss in the self-priming pump.The experimental results indicate that the improved self-priming pump structure has both good self-priming performance and high efficiency.The new structure of the vertical self-priming pump and its design method can provide reference for the similar pump.